linux/drivers/media/usb/gspca/sn9c2028.h

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treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 157 Based on 3 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license as published by the free software foundation either version 2 of the license or at your option any later version this program is distributed in the hope that it will be useful but without any warranty without even the implied warranty of merchantability or fitness for a particular purpose see the gnu general public license for more details this program is free software you can redistribute it and or modify it under the terms of the gnu general public license as published by the free software foundation either version 2 of the license or at your option any later version [author] [kishon] [vijay] [abraham] [i] [kishon]@[ti] [com] this program is distributed in the hope that it will be useful but without any warranty without even the implied warranty of merchantability or fitness for a particular purpose see the gnu general public license for more details this program is free software you can redistribute it and or modify it under the terms of the gnu general public license as published by the free software foundation either version 2 of the license or at your option any later version [author] [graeme] [gregory] [gg]@[slimlogic] [co] [uk] [author] [kishon] [vijay] [abraham] [i] [kishon]@[ti] [com] [based] [on] [twl6030]_[usb] [c] [author] [hema] [hk] [hemahk]@[ti] [com] this program is distributed in the hope that it will be useful but without any warranty without even the implied warranty of merchantability or fitness for a particular purpose see the gnu general public license for more details extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 1105 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Reviewed-by: Richard Fontana <rfontana@redhat.com> Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070033.202006027@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-05-27 14:55:06 +08:00
/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
* SN9C2028 common functions
*
* Copyright (C) 2009 Theodore Kilgore <kilgota@auburn,edu>
*
* Based closely upon the file gspca/pac_common.h
*/
static const unsigned char sn9c2028_sof_marker[] = {
0xff, 0xff, 0x00, 0xc4, 0xc4, 0x96,
0x00,
0x00, /* seq */
0x00,
0x00,
0x00, /* avg luminance lower 8 bit */
0x00, /* avg luminance higher 8 bit */
};
static unsigned char *sn9c2028_find_sof(struct gspca_dev *gspca_dev,
unsigned char *m, int len)
{
struct sd *sd = (struct sd *) gspca_dev;
int i;
/* Search for the SOF marker (fixed part) in the header */
for (i = 0; i < len; i++) {
if ((m[i] == sn9c2028_sof_marker[sd->sof_read]) ||
(sd->sof_read > 5)) {
sd->sof_read++;
if (sd->sof_read == 11)
sd->avg_lum_l = m[i];
if (sd->sof_read == 12)
sd->avg_lum = (m[i] << 8) + sd->avg_lum_l;
if (sd->sof_read == sizeof(sn9c2028_sof_marker)) {
gspca_dbg(gspca_dev, D_FRAM,
"SOF found, bytes to analyze: %u - Frame starts at byte #%u\n",
len, i + 1);
sd->sof_read = 0;
return m + i + 1;
}
} else {
sd->sof_read = 0;
}
}
return NULL;
}